//反转字符串一 力扣344
//用双指针反转字符串
class Solution {
public:
	void reverseString(vector<char>& s) {
		int len = s.size();
		for(int i = 0, j = len-1; i < len/2; i++, j--)
		{
			char tmp = s[i];
			s[i] = s[j];
			s[j] = tmp;
		}
		return;
	}
};
